超声耦合无线电能传输用发射换能器优化设计

Optimal Design of Transmitting Transducer for Ultrasonic Coupled Contactless Energy Transfer System

针对超声耦合无线电能传输系统研究的需要,对水下超声耦合无线电能传输系统发射换能器进行选型,确定换能器类型及工作频率。基于夹心式纵振压电换能器一维设计理论对发射换能器进行优化设计,在深入分析圆锥形前盖板延展系数对换能器振速比和等效机电耦合系数影响的基础上,选取的延展系数能同时兼顾换能器振速比和等效机电耦合系数均为较优值,并据此进一步确定换能器全部结构尺寸。实际测试结果表明,试制的发射换能器实际谐振频率为38.552 kHz,等效机电耦合系数为0.149,满足实际需要。

According to the research needs of ultrasonic coupled contactless energy transfer(UCCET)system,the transmitting transducer of underwater UCCET system is selected,and the type and operating frequency of the transducer are determined.Based on the one-dimensional design theory of the sandwiched longitudinal vibration piezoelectric transducer,the design of transmitting transducer is optimized.On the basis of the in-depth analysis of the influence of the extension coefficient of the conical front cover plate on the vibration velocity ratio and the equivalent electromechanical coupling coefficient of the transducer,the selected extension coefficient can simultaneously take into account the vibration velocity ratio and the equivalent electromechanical coupling coefficient of the transducer as the optimal value,then the overall structure size of the transducer is further determined.The actual test results show that the actual resonant frequency of the trial-produced transmitting transducer is 38.552 kHz,and the equivalent electromechanical coefficient is 0.149,which can meet the practical needs.